diff --git a/output_files/smog_chamber_study_2022-07-26_NatashaG.yaml b/output_files/smog_chamber_study_2022-07-26_NatashaG.yaml
index c390a9b..b33490c 100644
--- a/output_files/smog_chamber_study_2022-07-26_NatashaG.yaml
+++ b/output_files/smog_chamber_study_2022-07-26_NatashaG.yaml
@@ -10,6 +10,12 @@
     metadata_user_name:
       rename_as: metadata_user_name
       value: NatashaG
+    relative_humidity:
+      value: '70'
+      unit: '%'
+      description: Relative humidity represents the amount of water vapor present
+        in the air relative to the maximum amount of water vapor the air can hold
+        at a given temperature
   datasets: {}
 /gas:
   name: gas